Recent posts

#31

NXP / Re: Case for iMX8MP-SOM-EVB-IN...

Last post by ilario - October 16, 2025, 01:56:26 PM

It would be good to add it to https://github.com/hominoids/SBC_Model_Framework so cases could be generated for printing

Thanks for sharing that project, seems very convenient!
I started drafting the shape using the parameters from the Olimex's documentation, but surely I got plenty of dimensions wrong as I still don't have the actual hardware in my hands.
Feel free to correct the data I am preparing here:
https://github.com/hominoids/SBC_Model_Framework/compare/main...ilario:SBC_Model_Framework:Olimex-iMX8MP-SOM

#32

ESP32 / Re: ESP32-H2-DevKit-Lipo - Bat...

Last post by LubOlimex - October 16, 2025, 10:47:28 AM

Notice that when you have both USB and a battery attached, the battery measurement will not be correct, it will be influenced by the battery charger. The battery measurement is only correct when there is only battery powering the board. Hence it is helpful to utilize the External Power Sense and only measure the battery when there is no external power applied.

#33

ESP32 / Re: ESP32-H2-DevKit-Lipo - Bat...

Last post by lmerckx - October 15, 2025, 09:02:59 PM

Thanks for the answer.
I will try a longer charge and check values.

Thanks.

#34

New Product Ideas / could you provide a random pla...

Last post by APS - October 15, 2025, 12:16:44 AM

I use it as a standalone mp3 player, works great.  I would like to have a random play function.  I use it like listening to a great FM radio station that always plays the music you like and has no commercials.
alan

#35

ESP32 / Re: ESP32-H2-DevKit-Lipo - Bat...

Last post by LubOlimex - October 14, 2025, 04:31:50 PM

Seems fine to me. It just takes a lot of time to fully charge and discharge. The board is set to charge with only 100mA. Let it charge for a couple of hours and compare the value again. The JA-803450P should go up to 4.2V when fully charged. Alternatively let your software run only on battery and check the progress without connecting the USB to it.

#36

New Products release / OpenFest 2025 is this weekend ...

Last post by olimex - October 14, 2025, 12:10:37 PM

Join us this Saturday at OpenFest 2025 in Sofia for the traditional soldering workshop https://olimex.wordpress.com/2025/10/14/openfest-2025-is-this-weekend-in-sofia-come-and-join-us-in-saturday-at-the-traditional-soldering-workhop/ #openfest #soldering #workshop #oshw #foss

#37

NXP / RTC for iMX8MP-SOM-EVB-IND

Last post by ilario - October 13, 2025, 11:37:25 AM

On A64-OLinuXino there was an exposed contact for adding an external battery powering the Real Time Clock present on the board, as explained here, and it was very useful.

Is there something like this for the iMX8MP-SOM-EVB-IND?

Maybe using a UEXT module like the MOD-RTC2? But then, how should one use it? Should one write a Systemd unit probing the RTC and updating the system time? Is there something like that ready to use?

#38

ESP32 / ESP32-H2-DevKit-Lipo - Battery...

Last post by lmerckx - October 12, 2025, 07:27:57 PM

Hello,

I have the Olimex ESP32-H2-DevKit-Lipo and a battery 3.7V 1400mAh (JA-803450P) and try to measure the voltage of the battery to compute the percentage of the battery but I receive strange results.

I soldered jumpers BAT_SENSE_E and PWR_SENSE_E1 as explained in the manual and tried the example code to read pins 25 (POWER_SENSE) and 2 (BATTERY).

It works perfectly for the POWER_SENSE: testing with USB connection or battery only, it returns me the expected result.
But I have issues when trying to read the battery voltage.
- when connecting USB only: I always receive the analog value 652 or 653 (so 3716.40 mV or 3722,10 mV after multiplying by 5.7).
- when connecting both USB and battery: most of the time, I receive the same value but once on 10 measures I receive another value: 667 or 668 (so 3801.90 mV or 3807.60 mV). -> I suppose this to be the real measure of the battery because the value slightly increase with time.
- when connecting with battery only: again, I think I receive only the value 652 or 653. To be honest, I'm still not sure of that because I don't have the serial connection to debug and must rely only on my Zigbee report.

Is it the normal behavior of the pin ? I check my solder twice with multimeter and it seems quite good.
Any idea ?

Thanks in advance.

#39

UEXT / Re: MOD-GPS & TIMEPULSE pin

Last post by LubOlimex - October 10, 2025, 01:50:58 PM

Sadly I can't help. We receive MOD-GPS body already assembled.

No idea if you can open the box without breaking it. No idea if it is screwed or glued.

No idea if the pin is led out and available.

#40

UEXT / MOD-GPS & TIMEPULSE pin

Last post by stoyan - October 10, 2025, 11:45:31 AM

Hi there,
I want to use the receiver as time source. In this regard I have a couple of questions:

• can the plastic box be opened without breaking it (screws vs. glue)?
• is TIMEPULSE1 (PIO 11, 1PPS) pin broken out so I can use that for my purpose?

Greets!